TiH E CUBA REVIEW 



29 



Avery Tractor — Breaking up the prairie — With the breaker bottoms the sod is turned over 



in long ribbons, as shown. 



It is claimed that the enormous expense of using animal power exclusively on the farm 

 "today requires 25%, or a fom'th, of the total value of all agricultural products to feed the horses 

 and mules which are now used. Few. farmers have realized the fact that one-foixrth of their 

 acres were required to raise feed enough to cultivate the rest of their farm. Many farmers are, 

 however, now awakening to this fact and are replacing their surplus horses with tractor power, 

 .and, in this way, increasing their profits on both sides of the ledger — -raising larger crops and 

 ■doing their work with less expense. 



We formerly used horse power to do all our work. For belt work, both light and heavy. 

 we have now found that engine power is far the best and have discarded horse-power entirely. 

 Automobiles are competing strongly with hosres for doing the light hauling. It also now ap- 

 pears that tractors are just as much better than horses or mules for doing heavy hauling and 

 field work as engine power is better than horse-power for doing belt work. 



SUBMARINE INVENTION 



According to an article in the Havana 

 Post, Sr. J. N. Artola, formerly an officer 

 in the Cuban Navy, has invented an appara- 

 tus whereby, it is claimed, it will be possible 

 for a> submarine to remain below the surface 

 of the water for an indefinite period. Plans 

 of the invention have been presented to 

 the Chief of the Cuban Navy, and an ap- 

 paratus for experiments was built which 

 consists of a hermetically sealed box, the 

 .air in the interior not being renewable from 

 the outside, the inventor planning to have 

 the air renewed by a machine which is to 

 restore the air so that it will support human 

 life. The inventor was quite ready to make 



a demonstration of the practicability of his 

 apparatus, and July 6th was fixed for the 

 experiment. It was the inventor's intention 

 to be absolutely submerged in Havana 

 Harbor for the period of four hours, but 

 the Captain of the Port of Havana declined 

 to permit the experiment to be made as 

 originally planned, and the inventor entered 

 the hermetically sealed apparatus at 6:.32 

 A.M., and remained for three hours and 

 eighteen minutes, at which time he came 

 out and stated that the motor which operates 

 the machine for supplying the artificial air 

 was broken. Sr. Artola was greatly en- 

 couraged by his experiment, and announced 

 his intention of making a further trial at 

 a later date. 



